Combined compas and clinometer, 1870.
© Science Museum / Science & Society Picture Library
The inscription engraved on the top of this instrument designed by Captain Burnier reads; 'Balbreck aine Consteur / 81 Bart, Montparnase / Paris'. Magnetic compases are portable and easy to use for rapid surveying where high accuracy is not required. The compas disk and clinometer plate are enclosed in a bras case.